<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <el-row>
        <!-- 警告区域 -->
        <el-alert show-icon :closable="false" title="注意:只允许为第三分类设置相关参数" type="warning"></el-alert>
      </el-row>
      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品的分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist "
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数的按钮 -->
          <el-button
            @click="addDialogVisible=true"
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
          >动态参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 循环渲染tag标签 -->
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label="序号" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性的按钮 -->
          <el-button
            @click="addDialogVisible=true"
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
          >静态属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 循环渲染tag标签 -->
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column label="序号" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="100px">
        <!-- prop绑定的验证规则 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的表单 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="100px">
        <!-- prop绑定的验证规则 -->
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框v-model双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签名称,动态的
      activeName: 'many',
      manyTableData: [], // 动态参数的数据
      onlyTableData: [], // 静态属性的数据
      addDialogVisible: false, // 控制添加属性对话框的显示与隐藏
      addForm: {
        attr_name: ''
      }, // 添加参数的表单数据对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入属性名', trigger: 'blur' }, {}]
      },
      editDialogVisible: false, // 控制修改对话框的显示与隐藏
      editForm: {}, // 修改表单数据对象
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入属性名', trigger: 'blur' }, {}]
      }
      // // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // // 文本框中输入的内容
      // inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      let { data: res } = await this.$axios.get('categories')
      if (res.meta.status !== 200) {
        this.$message.error('获取商品分类失败')
      } else {
        this.catelist = res.data
        // console.log(this.catelist)
      }
    },
    // 级联选择框选中项变化,会触发的函数
    handleChange() {
      this.getParamsData()
      /*  console.log(this.selectedCateKeys)
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        return
      } else {
        // 证明选中的是三级分类
        // 根据所选分类的id,和当前所处的面板,获取对应的参数
        let { data: res } = await this.$axios.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
        if (res.meta.status !== 200) {
          this.$message.error('获取参数列表失败')
        }else{
            console.log(res);
            
        }
      } */
    },
    // tab页签的绑定事件
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        // 后来加的呀
        this.manyTableData = []
        this.onlyTableData = []
        return
      } else {
        // 证明选中的是三级分类
        // 根据所选分类的id,和当前所处的面板,获取对应的参数
        let { data: res } = await this.$axios.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
        if (res.meta.status !== 200) {
          this.$message.error('获取参数列表失败')
        } else {
          console.log(res.data)
          // ***** forEach 遍历数组res.data,把attr_vals字符串转成数组
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            // ***** 控制按钮与文本框的切换显示
            item.inputVisible = false
            // ***** 文本框中输入的内容
            item.inputValue = ''
          })
          if (this.activeName === 'many') {
            this.manyTableData = res.data
          } else {
            this.onlyTableData = res.data
          }
        }
      }
    },
    // 监听添加属性对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        } else {
          let { data: res } = await this.$axios.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
          if (res.meta.status !== 201) {
            this.$message.error('添加属性失败')
          } else {
            this.$message.success('添加属性成功')
            this.addDialogVisible = false
            this.getParamsData()
          }
        }
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id) {
      console.log(attr_id)

      // 查询当前参数的信息
      let { data: res } = await this.$axios.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
      console.log(res)

      if (res.meta.status !== 200) {
        this.$message.error('获取参数信息失败')
      } else {
        this.editForm = res.data
        this.editDialogVisible = true
      }
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      // 预校验
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return
        } else {
          let { data: res } = await this.$axios.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
          console.log(res)

          if (res.meta.status !== 200) {
            this.$message.error('修改参数失败')
          } else {
            this.$message.success('修改参数成功')
            this.getParamsData()
            this.editDialogVisible = false
          }
        }
      })
    },
    // 根据id删除对应参数项
    async removeParams(attr_id) {
      let confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除
      if (confirmResult !== 'confirm') {
        this.$message.info('已取消删除')
      } else {
        // 确认删除
        let { data: res } = await this.$axios.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        console.log(res)
        if (res.meta.status !== 200) {
          this.$message.error('删除参数失败')
        } else {
          this.$message.success('删除参数成功')
          this.getParamsData()
        }
      }
    },
    // 文本框失去焦点,或者按下enter键都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '' // 清空文本框内容
        row.inputVisible = false // 隐藏文本框
        return
      } else {
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
        /* // 需要编辑请求提交参数,保存这次操作
        let { data: res } = await this.$axios.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        })
        if (res.meta.status !== 200) {
          this.$message.error('修改参数失败')
        } else {
          this.$message.success('修改参数成功')

        } */
      }
    },
    // 从上抽离的
    async saveAttrVals(row) {
      // 需要编辑请求提交参数,保存这次操作
      let { data: res } = await this.$axios.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        this.$message.error('修改参数失败')
      } else {
        this.$message.success('修改参数成功')
      }
    },
    // 点击按钮,展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框获得焦点
      // $nextTick 方法的作用 就是当页面上元素被重新渲染之后,才会执行回调函数的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      } else {
        return null
      }
    },
    // 动态计算添加参数对话框标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>